Rotary cutter



Nov. 20, 1928.

, F. P. MILLER ROTARY CUTTER Filed July so, 1926 Guam Patented Nov. 20, 1928.

FRANK I; MILLER, 01 MEADVILLE, PENNSYLVANIA.

ROTARY A Application filed July 30,

This invention relates to rotary cutters such as milling cutters, reamers, counter bores and boring bars.

The invention forming the subject matter of this application has for an important object the provision of simple means whereby the blades of a rotary cutter may be expeditiously adjusted and securely locked in position to resist the strain to which the same are subjected during use.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawing forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a fragmentary perspective of an inserted blade rotary cutter constructed in accordance with the invention.

Figure 2 is a detail sectional view illustrating the holding means for the blades.

Figure 3 is a group perspective illustrating one of the blades and the holding and supporting means therefor.

Figure 4; is a detail sectional view illustrating a slight modification of the invention.

In the drawing the numeral 5 designates the body of a rotary cutter such as a milling cutter, a reamer, a counter bore or a boring bar and the body, is, as shown in Figure 1,provided with an annular series .of slots 6 for the reception of blades 7 and wedge members 8. Figures 2 and 3 clearly illustrate that the opposed sides of the members 7 and 8 are provided with transverse or substantially radial inter-fitting serrations 10, by which endwise movement of the blades with respect to the wedge members 8 is prevented and by which these parts is "the area of contact between substantially increased.

In carrying out the invention the side walls of the slots 6 may be parallel while the side walls of the blades may converge toward the outer edges thereof and the wedge members may gradually decrease in thickness toward the inner edges thereof to bring about the necessary binding of the blades in place when the wedge members are driven inwardly by a means to be described.

Attention is now invited to Figures 2 and 3 which illustrate that one side surface of each wedge member 8 is grooved longitudinally as shown at 14 to partially receive a locking pin 16, portions of which may be pro- CUTTER.

1926, Serial No. 125,954. I

vided with notches 18 for engagement by the conical ends of set screws 20. The set screws are, of course, threaded into openings 21 in the body and it is obvious that when the set screws are tightened the pin 16 will be forced laterally into binding engagement with the wedge and the wedge will be forced inwardly in a substantially radial direction to lock.

the adjacent blade firmly in place.

It will be seen that longitudinal adjustment of the blades ismade a simple matter by the mere loosening of the set screws and the manual shifting of the blades in the slots, after which the blades may again be anchored firmly in place. When the blades have been .anchored firmly in place, as described, the

same will effectively resist the strain to which the same are subjected.

Figure 3 illustrates that one end of the groove 1a is closed for engagement by the pin 16 whereby end thrust on wedge 8 is transmitted to the pin and since the pin is securely locked in place the wedge will be firmly held against endwise movement.

In the form of invention shown in Figure 4; the slots may have side walls which converge toward the bottoms-of the slots for engage ment by the outer surfaces of blades 30 and wedge members 31. In this form of invention the opposed sides of the blades 30 and wedges 31may be provided with interfitting substantially radial serrations 32 and the blades 30 may have parallel sides while the wedge members 31 taper toward the inner edges thereof, so that when the wedge members are forced inwardly the blades will be firmly locked in place.

In carrying out the form of invention shown in Figure 4 the locking pin 34 is driven into binding engagement with the wedge members 31 by set screws 36, the same as in the form of invention illustrated-in Figures 1 to 3 inclusive.

Having thus described the invention, what is claimed is:

1. -A rotary cutter comprising a body having a slot, a blade in said slot and having side walls converging toward the outer edge of the blade, a wedge member tapered toward the inner edge thereof and having means engaging said blade, one side of said wedge memher being provided with a longitudinal gro we, a pin partially received in said groove, and securing devices for forcingsaid pin laterally and inwardly into binding engagement with said wedge member.

2. An inserted blade cutter comprising. a body having a slot, a work engaging member in said slot and consisting of a pair of oppositely tapered sections having the opposed sides thereof provided with int-erfitting hold ing means, one of the sections being provided with a groove, a pin in said groove, and a fastening device engaging said pin and forcing the same laterally into binding engagement with the wall of said groove.

3. An inserted blade cutter comprising a body having a slot, a Work engaging member in said slot and consisting of a pair of sections having the opposed sides thereof provided with interfitting holding means, one of the sections being provided with a groove having a closed end, a pin in said groove and engaging the closed end thereof to receive J 4. An' inserted blade cutter comprising'a body having a slot, a work engaging member in said slot and consisting of a pair of sections having the opposed sides thereof in contact, one of the sections being provided in one side thereof with a groove having a closed end, a pin in said groove and engaging the closed end thereof to receive end thrust from the grooved section, and a fastening device engaging said pin andforcing the same laterally into binding engagen' ent with the Wall of said groove.- r

In testimony whereof I affix my signature.

FRANK P. MILLER. 

